试题与答案

小张在研究“蹼是如何有助于水中游泳的”时设计了如下实验: (1)在一个水槽中装满

题型:填空题

题目:

小张在研究“蹼是如何有助于水中游泳的”时设计了如下实验: 

(1)在一个水槽中装满水。

(2)将右手伸入水中,在水中来回摆动。

(3)在右手上套一个薄的透明塑料袋,在手腕处用皮筋扎紧。

(4)重复做(2)的动作。

他通过实验发现,在两种不同情况下,手的摆动对水的推动力较大的是__                __。根据这个模型你能解释青蛙、鸭等水中游泳的动物都具有蹼的意义___               _。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, C解析:资产负债率是负债总额除以资产总额的百分比,在计算资产负债率时需要用到负债总额和资产总额。

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